Darn. I meant this to go to the list. Sorry Thomas.
-------- Forwarded Message --------
> You have here a strong conflict
> (complexity/granularity) that can, as far is I know and from what
I've
> seen, be simply solved by this way:
> - the assembly is a simple XML file that contain pointers to other
CAD
> files and an absolute 3x4 position matrix,
> - store the CAD files and the XML in your PDM system,
> - generate the 'assembly view' on the fly whenever requested.
This is more-or-less what I was after. After some quality time spent
with the OCC user manuals, and also with the help your XCAF demo, I've
figured out that XDE/XCAF does indeed do what I want.
I'm trying to create a (STEP) document in which I insert some shapes
(each defined according to their own local coords), then position these
shapes in the global coords to form an assembly. Adding some color is
also nice.
I don't need fancy (SolidWorks style) "mating" functionality.
I've attached my working example, in case it's useful to others.
> At last, if one really wants to be rigourous, follow the STEP PDM
Schema
> 1.2 specifications:
>
http://www.steptools.com/support/stdev_docs/express/pdm/pdmug_release4_3.pdf
> . This document is a master piece, in my opinion the best ever
written
> about assemblies (and a lot more things), that everyone should read
once!
I'm looking at this. It may take me a while to digest...
thanks for the comments.
Bryan
from OCC import XCAFApp, STEPCAFControl, TDocStd, TCollection,\
XCAFDoc, BRepPrimAPI, Quantity, STEPControl,\
TopLoc, gp
#
# Create the TDocStd document
#
h_doc = TDocStd.Handle_TDocStd_Document()
print "Empty Doc?", h_doc.IsNull()
#
# Create the application
#
app = XCAFApp.GetApplication().GetObject()
app.NewDocument(TCollection.TCollection_ExtendedString("MDTV-CAF"),h_doc)
#
# Get root assembly
#
doc = h_doc.GetObject()
h_shape_tool = XCAFDoc.XCAFDoc_DocumentTool().ShapeTool(doc.Main())
l_Colors = XCAFDoc.XCAFDoc_DocumentTool().ColorTool(doc.Main())
shape_tool = h_shape_tool.GetObject()
colors = l_Colors.GetObject()
top_label = shape_tool.NewShape() #this is the "root" label for the assembly
print "Is Assembly", shape_tool.IsAssembly(top_label) #not yet, 'cos it's empty
#
#Add some shapes
#
box = BRepPrimAPI.BRepPrimAPI_MakeBox(10,20,30).Shape()
box_label = shape_tool.AddShape(box, False)
cyl = BRepPrimAPI.BRepPrimAPI_MakeCylinder(25,50).Shape()
cyl_label = shape_tool.AddShape(cyl, False)
#
#Add components as references to our shape
#
tr = gp.gp_Trsf()
tr.SetTranslation(gp.gp_Vec(100,100,100))
loc = TopLoc.TopLoc_Location(tr)
box_comp1 = shape_tool.AddComponent(top_label, box_label, loc)
tr = gp.gp_Trsf()
tr.SetTranslation(gp.gp_Vec(200,200,200))
loc = TopLoc.TopLoc_Location(tr)
box_comp2 = shape_tool.AddComponent(top_label, box_label, loc)
tr = gp.gp_Trsf()
tr.SetTranslation(gp.gp_Vec(150,200,100))
loc = TopLoc.TopLoc_Location(tr)
cyl_comp = shape_tool.AddComponent(top_label, cyl_label, loc)
print "Is Assembly", shape_tool.IsAssembly(top_label) #it is now...
#
#Add some colors
#
red = Quantity.Quantity_Color(Quantity.Quantity_NOC_RED)
green = Quantity.Quantity_Color(Quantity.Quantity_NOC_GREEN)
colors.SetColor(cyl_comp, red, XCAFDoc.XCAFDoc_ColorGen)
colors.SetColor(box_comp2, green, XCAFDoc.XCAFDoc_ColorGen)
mode = STEPControl.STEPControl_AsIs
writer = STEPCAFControl.STEPCAFControl_Writer()
writer.Transfer(h_doc, mode)
writer.Write("XDE_test.step")
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